1321402121 has 8 divisors (see below), whose sum is σ = 1426341000. Its totient is φ = 1216933632.

The previous prime is 1321402051. The next prime is 1321402123. The reversal of 1321402121 is 1212041231.

It can be written as a sum of positive squares in 4 ways, for example, as 34386496 + 1287015625 = 5864^2 + 35875^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321402121 - 2²² = 1317207817 is a prime.

It is a super-2 number, since 2×1321402121² = 3492207130766597282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321402121.

It is not an unprimeable number, because it can be changed into a prime (1321402123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111746 + ... + 123003.

It is an arithmetic number, because the mean of its divisors is an integer number (178292625).

Almost surely, 2^1321402121 is an apocalyptic number.

It is an amenable number.

1321402121 is a deficient number, since it is larger than the sum of its proper divisors (104938879).

1321402121 is a wasteful number, since it uses less digits than its factorization.

1321402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235195.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1321402121 is about 36351.0951829515. The cubic root of 1321402121 is about 1097.3495751895.

Adding to 1321402121 its reverse (1212041231), we get a palindrome (2533443352).

The spelling of 1321402121 in words is "one billion, three hundred twenty-one million, four hundred two thousand, one hundred twenty-one".